deriveP

Derivative of matrix V.


Syntax
   dV = deriveP(V, supc)

Description
   dV = deriveP(V, supc) returns the matrix 
   containg all derivatives of V=orth2powmatrix matrix. dV is 
   required when polyval is choosen instead of orthoval. 
   Remark: always use orthoval instead of polyval.

Input
   orth2powmatrix    = matrix such that XV = P (double matrix). 
   supc = suplementary conditions (double matrix or cell of strings).

Output
   dV   = block matrix [n x n x k], where each n = 1, ..., k contains
          the derivatives (double matrix).